Electron correlation in the second Landau level: a competition between many nearly degenerate quantum phases |
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Authors: | Xia J S Pan W Vicente C L Adams E D Sullivan N S Stormer H L Tsui D C Pfeiffer L N Baldwin K W West K W |
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Affiliation: | University of Florida, Gainesville, Florida 32611, USA. |
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Abstract: | At a very low-temperature of 9 mK, electrons in the second Landau level of an extremely high-mobility two-dimensional electron system exhibit a very complex electronic behavior. With a varying filling factor, quantum liquids of different origins compete with several insulating phases leading to an irregular pattern in the transport parameters. We observe a fully developed nu=2+2/5 state separated from the even-denominator nu=2+1/2 state by an insulating phase and a nu=2+2/7 and nu=2+1/5 state surrounded by such phases. A developing plateau at nu=2+3/8 points to the existence of other even-denominator states. |
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